Control system for hybrid powertrain

Method to determine a preferred operating range for a plurality of torque-generative devices, each torque-generative device operable to provide motive torque to a torque transmission device, comprising:

• defining a first operating range in a first operating space;
• defining a second operating range in the first operating space;
• transforming the first operating range and the second operating range to a second operating space;
• and,
• defining the preferred operating range in the second operating space based upon the transformed first operating range and the transformed second operating range.

Control system for a powertrain comprising an internal combustion engine and a pair of electrical machines operably coupled to a two-mode compound-split electro-mechanical transmission, comprising:

• a plurality of electronic controllers signally interconnected via a local area network and operable to control the engine and the transmission based upon operator inputs determinable via a user interface;
• the control system including a storage medium having a computer program encoded therein operable to determine a preferred operating range for each of the electrical machines, said program comprising:
• code for defining a first operating range in a first operating space;
• code for defining a second operating range in the first operating space;
• code for transforming the first operating range and the second operating range to a second operating space;
• and,
• code for defining the preferred operating range in the second operating space based upon the transformed first operating range and the transformed second operating range.